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Just wannah add something to the first two q's- as wabash1 said, these things ("slugs") are retired or wrecked engines. Traction motors help distribute power from other locos. Also, the top part is often filled with concrete to add more weight.(more weight - better traction) And another question- often, extra locomotives in consist are put there to help the front loco. They also might be placed in the end of the train or in the middle. Here in Alaska, an extra loco might also generate the power for passenger cars (heating, electricity and stuff) <br /> Good questions, by the way. You have found the right place to get them answered. <br />
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